Diamond-cutting.



No. 7|2,|55.' .Patented Oct. 23, I902.

- w. ntsannou, DIAMOND CUTTING.

(Application filed Apr. 2, 1902.)

-(No Ilodel.)

K b lul J f l H b 13 9 v [Mm/5555s.- INVENTOR.

ATTORNEY? UNITED STATES PATENT OFFICE.

NVILLIAM D. SEDDON, OF PATERSON, NEW JERSEY.

DIAMOND-CUTTING.

SPECIFICATION forming part of Letters Patent N 0. 712,155, dated October28, 1902. Application filed April 2, 1902. Serial No. 161,138- (Nomodel.)

To all whom it may concern:

Beit known that I, WILLIAM D. SEDDON, a citizen of the United States ofAmerica, and a resident .of Paterson, in the State of New Jersey, haveinvented a new and useful Improvement in Diamond-Cuttin g, of which thefollowing is a specification, reference being had therein to theaccompanying drawings, which form a part thereof.

The invention relates to the cutting of diamonds or other preciousstones; and it consists, essentially, in cutting the upper and lowersurfaces to form peculiarly shaped facets, as will be hereinafter fullydescribed, and particularly set forth in the claims.

The principal object of the invention is to enhance the brilliancy ofprecious stones, more especially diamonds, to intensify the prismatichues, and to increase the receptive and reflective surface by incisiveor what may be termed inside cutting.

In the drawings, Figure 1 is a top view of the diamond according tomyinvention; Fig. 2, a side elevation; Fig. 3 a View of the bottom; andFig. 4 is a vertical section taken along the valley-line 0, showing theformation of the valley.

Referring to Figs. 1 and 2, it will be seen that the table or top of theupper part of the stone is formed of horizontal ridges or edges b b,which meet and intersect at the center in the same horizontal plane,having sloping triangular sides or facets a a a, radiating from thecenter, forming the valleys cc between them, said valleys sloping fromthe center toward the girdle. These prismatic facets are surrounded by aseries of pentagonal and triangular facets d d d and e e e, forming thebezel and reaching to the girdle of the stone.

The lower or under side of the stone, as shown in Figs. 2 and 3, has adeeply-cut set of valleys between ridges, forming sloping triangularfacets at the extremity in lieu of the apex or culex of the invertedpolygonal pyramid which forms the bottom of the common brilliantcutting, and in this lower prismatic table the ridges or edges ff meetand intersect at the center in the same horizontal plane and havesloping triangular sides or facets g g, radiating from the center, andthe valleys it A: between them, that slope from the center toward thegirdle. These facets are surrounded by a series of pentagonal facets hhk, that form the sides of the inverted truncated cone, and a series oftriangular facets t't'z', reaching to the girdle, which is the base ofthe truncated cone.

My improvement, as will be seen, cuts the what I claim as new, anddesire to secure by Letters Patent, is-- 1. As an article ofmanufacture, a diamond, or other precious stone, the table or top ofwhich consists of ridges b b, lying in a common horizontal planeintersecting at a common center, and having sloping triangular sides orfacets, a a a, radiating from the center, forming between them thesunken portions or valleys, c c, which slope from the center toward thegirdle, and a series of pentagonal and triangular facets, d cl d, and ee 6, respectively surrounding the facets a a a, forming the bezel andreaching to the girdle of the stone, substantially as set forth.

2. As an article of manufacture, adiamond, or other precious stone,having its top or upper face suitably cut and its bottom or lower faceat the central extremity consisting of ridges f f, in the samehorizontal plane and intersecting at the center, and which have slopingtriangular sides or facets g g, radiating from the center, formingbetween them the sunken portions or valleys k k, that incline from thecenter toward the girdle, and a series of oblong pentagonal facets, h hh, and a series of triangular facets, i t' 71, respectively surroundingthe facets g g and reaching to the girdle, substantially as specified.

3. As an article of manufacture, a diamond or other precious stone, thetable or top of which consists of edges or ridges in the same horizontalplane intersecting at the center and which have sloping triangular sidesor facets, radiating from the center, forming befrom the center towardthe girdle, and a series of oblong pentagonal facets and a series oftriangular facets respectively surrounding tween them sunken portions orvalleys that slope from the center toward the girdle, and a series ofpentagonal and triangular facets surrounding the said facets forming thebezel the said facets and extending to the girdle. and extending to thegirdle, and its bottom In testimony whereof I affix my signature orlower face at the central extremity consistin presence of two witnesses.

ing of ed es or rid es in the same horizontal plane an d intersezting atthe center, and WILLIAM SEDDON' which have sloping triangular sides orfacets, Witnesses: radiating from the center, forming between JOHN F.KERR, them sunken portions or valleys, that incline GUS. LANG.

